Improvement in paper-bag machines



UNITED STATES PATENT ()FFIGE.

MERRIOK MURPHY, OF CINCINNATI, OHIO.

IMPROVEMENT IN PAPER-BAG MACHINES.

Specification forming part of Letters Patent No. 135,145, dated January21, 1873.

To all whom it may concern:

Be it known that I, MERRIoK MURPHY, of Cincinnati, Hamilton county,Ohio, have invented certain new and useful Improvements in Paper-BagMachines, of which the following is a specification:

Nature and Objects of Invention.

My invention consists, first, in a peculiar device for applying paste tothe side of the sheet of paper as it is fed from the roll, consisting ofan endless band stretched and operated by two rollers, one roller beingimmersed in a paste-vat, and the band being so arranged as to press,while in motion, upon one edge of the paper sheet, the latter beingsupported against said pressure by a loosely-revolving roller; second,in a peculiar construction and manner of attachment of the former-plate,around which the blanks are folded, by which its whole weight is made torest upon the paper, and by which it is prevented from running forwardwith the paper sheet, which is fed by an endless belt; third, incombination with the former-plate of a drying-cylinder or belted pulley,so arranged that its belt is made to feed the blanks when out 01f;fourth, in a certain combination and arrangement of the reciprocatingfolding and pasting blade, for folding and pasting the bottom seam ofthe bag, and the drying-cylinder with its endless belt, by which thesaid belt is made to assist in the formation of the bottom seam of thebag; fifth, in combination, with the reciprocating folding and pastingblade for forming and closing the bottom seam of the bag, of a pastevathaving a revolving roller fitted to its bottom, from which the saidblade is made, in its own reciprocating motion, to receive paste uponits front or folding edge only.

a diagram of the paper blank cut out to form a bag.

General Description.

A is the sheet of paper from which the bags are to be formed, wound upona roller, B, and passing over and between guide and feed rol1- ers b b bb, the second of which, b, presses one edge of the paper again st theendless band. C, which is stretched over two rollers, c c, the upperone, 0, being driven by a belt connected with the driving-pulley Z, andthe lower one, 0, being immersed in a vat, D, containing paste, so thatthe belt applies a continuous coating of paste to one edge of the paperA.

The feed-rollers b b deliver the sheet to the cutters, one of which is apeculiarly-shap ed fixed blade, E, over which the paper passes, whilethe upper cutter, E, consists ofa straight knife- .blade, attached bymeans of screws, by which it is adjustable, to the plate 0, whose endsare set in the two plates or heads F F, set ona revolving shaft which isdriven from Z. Each revolution of this cutter measures off the length ofpaper necessary to form a bag, which is severed by the contact of theknife-edges, and these are so shaped as to cut it to a pattern, (see X,Fig. 1,) leaving in the middle a pro jectin g flap, g, to be afterwardturned over to form the bottom seam of the bag. The shaped blank is nowpassed between the feed-rollers h h, and delivered onto the feed belt Gunder the former-plate I, which rests with its weight upon the paper,but is withheld from lateral or longitudinal motion by the hook-plate i,embracing a recess in the roller It. On each side of it are the bentfolding plates i i i i, which gradually bend up and double over thesides of the paper blank as it passes between them, finally pressing thepasted edge firmly down upon the lap from the other side. The shaft ofthe cutter-heads F F, by means of an eccentric wrist-pin,f, pitman f andbell-cranks ff, is so connected with a shaft, 70, as to give areciprocating motion to the bent fold ing and pasting blade K, securedto the shaft k by two arms, I l, in such a manner that at each strokeits front edge is brought into contact with the roller m, fitted to andrevolving in the bottom of a hopper-shaped paste-vat, L, and receives acharge of paste therefrom. As the folded paper blank traveling upon thefeed-belt passes between the rollers h h', the descending stroke of thefolding blade K presses it down between the belt G and the cylinder M insuch a manner as to double the flap 9 back upon the bag, at the sametime pasting the inner surface of said flap, and the now completed bagpasses on, firmly pressed between the belt and the cylinder, till it isde livered over the apron at N.

The space cut out to form the flap g for the following bag leaves oneside of the finished bag longer than the other, forming a convenientmouth, and affording a flap to be turned down by hand, if necessary, forclosing and sealing the mouth.

The cylinder M is a metal drum, heated by steam, or in other preferredmanner, for speedily drying the paste in the seams of the bags, whichare pressed firmly against it by the belt G. The belt may be stretchedover the auxiliary pulleys P P P P.

I am aware that applying a continuous belt of paste to paper as it isdrawn from aro1l,by means of an endless belt, is not new, broadly. Itherefore limit my claim of this feature to the specific arrangement ofthe parts, which is such that the paste-belt can travel over stationarypulleys, and, bearing against the guideroller over which the paperpasses, will continue pasting the latter to the end without requiringadjustment of the reel or any other part.

Claims.

1. The arrangement of paste-vat D, belt 0 and its rollers c c, andguide-roller b, for applying paste to the edge of a continuous sheet ofpaper, substantially as specified.

2. In combination with the former-plate I, the hook i and grooved orrecessed feed-roller h, as and for the purpose set forth.

3. The combination of the former-plate I, endless carrying-belt G andits guide-roll h, drying-cylinder M, arranged outside of the said belt,and a folding-blade, the whole operating substantially as specified.

4.. The combination of the folding and pastin g blade K, drying cylinderM, belt G, and its gnide-rollerh for forming the bottom seam of the bag,substantially as specified.

5. In combination with the elements of the fourth claim, the paste-vat Land paste-roller m, the Whole arranged and operating substantially inthe manner and for the purpose spec ified.

In testimony of which invention I hereunto set my hand.

MERRIOK MURPHY.

IVitnesses:

FRANK 1\IILWAR1), J. L. WARTMANN.

